Does anyone on here have the ability to run a similar dive on a desktop deco program (yes I know we don't know his actually gases but....) just to get a ballpark figure of where his first few deep stops might have been (just for ballpark, as I said)? I don't have access to a desktop program at moment, so if someone would kindly run it and post here please, that would be much appreciated. TIA.
Kay Dee I do not usually post dive plans .... there are too many people ready to take it up and dive them.
This one is so extreme tha I do not believe any body would dive it but nevertheless I am I going to obliterate the middle of it just to make sure ....
In developing this plan I kept in mind I want a bit of nitrogen in my deep mix (a bit of narcosis is believed to abate a bit HPNS by reducing the speed of neuro transmission) and ICBD ....
What it cannot be mitigated is gas density, OTU and CNS. I am using my gas consumptions here for a normal dive to calculate gas volumes.
Also you will notice this is a 20 hrs dive and I did use Buhlmann GF 45/85. Nothing I would use for a dive below 100 also gas at those oxygen contents cannot be analysed successfully with a lead oxygen sensor but need more sophisticated analysis methods.
At the bottom the choosen gas (planning purpose) gives you an extreme exposute (2 bar ppO2). I did not consider a travel gas but probably using the 20/75 down to 70 meters would be a great idea, especially because starting with the 6/90 would kill you before even starting the dive ....)
DISCLAIMER this plan is intentionally incomplete, non working and if YOU DIVE IT IT WILL KILL YOU.
Study and discussion use only.
Decompression model: ZHL16-B + GF
DIVE PLAN
Surface interval = 5 day 0 hr 0 min.
Elevation = 0m
Conservatism = GF 45/85
Dec to 150m (8) Trimix 6/90 18m/min descent.
Dec to 330m (12) Trimix 6/90 40m/min descent.
Level 330m 0:10 (13) Trimix 6/90 2.02 ppO2, 7m ead, 24m end
Asc to 141m (36) Trimix 6/90 -8m/min ascent.
Stop at 141m 5:22 (42) Trimix 6/90 0.90 ppO2, 0m ead, 5m end
Stop at 138m 1:00 (43) Trimix 6/90 0.88 ppO2, 0m ead, 5m end
Stop at 135m 2:00 (45) Trimix 6/90 0.86 ppO2, 0m ead, 4m end
Stop at 132m 1:00 (46) Trimix 6/90 0.85 ppO2, 0m ead, 4m end
Stop at 129m 2:00 (48) Trimix 6/90 0.83 ppO2, 0m ead, 4m end
[Missing stops from 126 to 21 mt and 2 gas changes]
Stop at 21m 54:00 (786) Triox 50/30 1.54 ppO2, 0m ead, 12m end
Stop at 18m 59:00 (845) Triox 50/30 1.39 ppO2, 0m ead, 10m end
Stop at 15m 67:00 (912) Triox 50/30 1.24 ppO2, 0m ead, 7m end
Stop at 12m 77:00 (989) Triox 50/30 1.10 ppO2, 0m ead, 5m end
Stop at 9m 90:00 (1079) Triox 50/30 0.95 ppO2, 0m ead, 3m end
Stop at 6m 36:00 (1115) HeliOx 90/10 1.44 ppO2, 0m ead, 4m end
Stop at 4.5m 132:00 (1247) HeliOx 90/10 1.30 ppO2, 0m ead, 3m end
Surface (1251) HeliOx 90/10 -1m/min ascent.
OTU's this dive: 1364
CNS Total: 903.7%
Gas density: 9.3g/l
23457.7 ltr Trimix 6/90
15028.1 ltr Trimix 12/85
3247.1 ltr Trimix 18/75
49624.9 ltr Trimix 20/75
16726.2 ltr Triox 50/30
5062.0 ltr HeliOx 90/10
113145.9 ltr TOTAL